We are working with a developer and would like to know the rules and regulations around BTSA to help them sell their properties:1. Does a BTSA have to be listed on the MLS listing? 2. Can it be offered at a real estate event as a certificate for attendees?3. If so, can the BTSA be offered at different levels (i.e.: 3K for attending without a client, 5K for attending with a client)?Thank you for your advice!